Basically, it boils down to personal INTEGRITY, MORAL OBLIGATION, and personal HONOR; and a willingness to comply with the simple FCC Rules and Regs. The 'exports' aren't certificated [formly type excepted] and as they can be modified for illegal purposes, aren't even legal, to be sold in the United States; no matter what else you may have heard or read. Do you really need to 'screw up' the RF spectrum for everyone else with units which, in the majority of cases would FAIL an honorable knowledgeable technicians' bench test? An automotive comparison, might be that you can own and drive a high performance sports car, but where can you legally 'open her up' and experience the cars full potential. Not too many places, without disregarding everyone elses well being. These exports are noted for out of band harmonics, along with a plethora of other technical problems. I personally maintain a high standard, and will NOT accept any of these units
for repair.